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<br />the conceplual model and computer representation, <br />can be pictured as Ihe flltering process depicted by <br />Figure 1.3. The rea! world is "viewed" through vari- <br />ous descriptive dala. The conceplua! model is pro- <br />duced from these data and previous experience and <br />then becomes the basis for the working model. The <br />descriptive data may be improved by addition or re- <br />finement. Improvements in Ihe conceptua! model <br />lead to improvements in the working model. Outpul <br />from the working model can be compared with corres- <br /> <br />ponding situations in the real world; and when signifi- <br />cant discrepancies (with respect 10 the intended model <br />application) exisl between the two, adjustment can be <br />made. <br /> <br />Three aspects of the model conslruction process <br />are Ihus particularly important: I) Operational defini- <br />tions of variables need to be specified; 2) data need 10 <br />be analyzed to formulale mathematical relationships <br />as weli as to verify them; 3) models are a!ways sub- <br /> <br /> <br />N <br />~ <br /> <br />EXPLANATION <br />6 STREAMFLOW <br />o PRECIPITATION <br />~ PRIOCIPITATION AND AIR <br />TEMPERATURE <br />QI] RURAL WATERSHED AREAS <br /> <br />CLIMATOLOGICAL STATIONS <br />CWW COTTONWOOD WEIR <br />LMC LOWER MILL CREEK <br />MCC MILL CREEK CANYON <br />SLB SILVER LAKE BRIGHTON <br /> <br />Figure 1.1. Watershed boundlJries and locations of the streamflow gages climatological stations within the <br />study area. <br /> <br />4 <br />